THE POTATO 205 



The earlier in the fall that this remedy can be ap- 

 plied the more satisfactory will be the results. It 

 is better not to trust to one treatment, but to work 

 over these places several times at short intervals. 

 When young, or even when full-grown, grasshop- 

 pers may be caught successfully in a hopper pan. 

 If this is set on wheels a few inches above the sur- 

 face of the ground and driven over the alfalfa when 

 that is a few inches high, great numbers may be 

 caught. The best time to do this is in the early 

 morning when the hoppers are on the tops of the 

 stems and somewhat numbed with the cold. A 

 third remedy is arsenic-bran mash. This sub- 

 stance is made by mixing white arsenic with bran 

 at the rate of one pound of arsenic to twenty of 

 bran. After the substances are thoroughly mixed 

 add sufficient water to make a sticky but not too 

 sloppy material. Some add a little anise or syrup. 

 The mixture should be scattered late in the after- 

 noon or early in the morning so that the hoppers 

 will get it before the hot sun has dried it up. 



"In the Greeley experiments of 1910 the pota- 

 toes were sprayed with Bordeaux mixture to test 

 the value of this substance as a repellent to grass- 

 hoppers. The results appeared to be favorable as 

 to keeping off grasshoppers, but indecisive as to the 

 prevention of flea beetle injuries to potato tubers. " 



THE POTATO EELWORM 



The Potato Eelworm (a thread worm, Hetero- 

 dera Radicola) is about one twenty-fifth of an inch 

 long, and works in the mature tuber. It has been 

 found in Nevada potatoes shipped to California. 

 The following is from Nevada Experiment Station 

 "Bulletin 70 "• 



